page_title: Antalo Limestone
section_title: Lithology
hierarchical_section_title: Antalo Limestone / Lithology
caption_attribution_description: English: Rock sample 7 Upper limestone formation Miheno
context_page_description: The Antalo Limestone, also known as the Antalo Sequence, is a geological formation in Ethiopia. It is between 300 and 800 metres thick and comprises fossiliferous limestones and marls that were deposited in a reef. Marine microfossils have shown an age between 165 and 150 million years.
context_section_description: The limestones and marls of the Antalo Sequence also hold shale and calcareous sandstone layers. The Antalo Limestone comprises four members: (1) a basal member with grainstone and wackestone lithologies, with marly interlayers and in the upper part stromatoporoid coral-like level; (2) sandy limestone deposited in estuaries and lagoons; (3) micritic (very fine grained) limestone with intercalations of wackestone and coquina beds deposited in relatively deep water; and (4) a succession of marls and limestone, with cherty limestone at the base.
caption: Rock sample from the fourth (upper) member, collected in Miheno
exif: {"Image Make": "samsung", "Image Model": "SM-A320FL", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "A320FLXXS4CSG5", "Image DateTime": "2019:12:05 14:31:46", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "204", "Thumbnail ImageWidth": "512", "Thumbnail ImageLength": "384", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail Orientation": "Rotated 180", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1018", "Thumbnail JPEGInterchangeFormatLength": "3120", "EXIF ExposureTime": "1/50", "EXIF FNumber": "19/10", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "50", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2019:12:05 14:31:46", "EXIF DateTimeDigitized": "2019:12:05 14:31:46", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "253/50", "EXIF ApertureValue": "37/20", "EXIF BrightnessValue": "211/100", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "37/20", "EXIF MeteringMode": "CenterWeightedAverage", "EXIF Flash": "Flash fired", "EXIF FocalLength": "18/5", "EXIF SubSecTime": "0327", "EXIF SubSecTimeOriginal": "0327", "EXIF SubSecTimeDigitized": "0327", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "4128", "EXIF ExifImageLength": "3096", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "828", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF FocalLengthIn35mmFilm": "27", "EXIF SceneCaptureType": "Standard", "EXIF ImageUniqueID": "W13LSJA01PM W13LSKL01PA", "EXIF OffsetSchema": "-46"}